generic: backport 5.16 fix for hv utils build failure

Backports following fix:

 hv: utils: add PTP_1588_CLOCK to Kconfig to fix build

 The hyperv utilities use PTP clock interfaces and should depend a
 a kconfig symbol such that they will be built as a loadable module or
 builtin so that linker errors do not happen.

 Prevents these build errors:

 ld: drivers/hv/hv_util.o: in function `hv_timesync_deinit':
 hv_util.c:(.text+0x37d): undefined reference to `ptp_clock_unregister'
 ld: drivers/hv/hv_util.o: in function `hv_timesync_init':
 hv_util.c:(.text+0x738): undefined reference to `ptp_clock_register'

References: https://lore.kernel.org/stable/[email protected]/T/#u
Signed-off-by: Petr Štetiar <[email protected]>

target/linux/generic/backport-5.15/730-v5.16-hv-utils-add-PTP_1588_CLOCK-to-Kconfig-to-fix-build.patch

@@ -0,0 +1,46 @@
+From fba2153a200716c1fec1eafda7356bb347589efb Mon Sep 17 00:00:00 2001
+From: Randy Dunlap <[email protected]>
+Date: Thu, 25 Nov 2021 18:33:16 -0800
+Subject: [PATCH] hv: utils: add PTP_1588_CLOCK to Kconfig to fix build
+
+The hyperv utilities use PTP clock interfaces and should depend a
+a kconfig symbol such that they will be built as a loadable module or
+builtin so that linker errors do not happen.
+
+Prevents these build errors:
+
+ld: drivers/hv/hv_util.o: in function `hv_timesync_deinit':
+hv_util.c:(.text+0x37d): undefined reference to `ptp_clock_unregister'
+ld: drivers/hv/hv_util.o: in function `hv_timesync_init':
+hv_util.c:(.text+0x738): undefined reference to `ptp_clock_register'
+
+References: https://lore.kernel.org/stable/[email protected]/T/#u
+Fixes: 3716a49a81ba ("hv_utils: implement Hyper-V PTP source")
+Signed-off-by: Randy Dunlap <[email protected]>
+Reported-by: kernel test robot <[email protected]>
+Cc: Arnd Bergmann <[email protected]>
+Cc: "K. Y. Srinivasan" <[email protected]>
+Cc: Haiyang Zhang <[email protected]>
+Cc: Stephen Hemminger <[email protected]>
+Cc: Wei Liu <[email protected]>
+Cc: Dexuan Cui <[email protected]>
+Cc: [email protected]
+Cc: Greg Kroah-Hartman <[email protected]>
+Reviewed-by: Michael Kelley <[email protected]>
+Link: https://lore.kernel.org/r/[email protected]
+Signed-off-by: Wei Liu <[email protected]>
+(cherry picked from commit 1dc2f2b81a6a9895da59f3915760f6c0c3074492)
+---
+ drivers/hv/Kconfig | 1 +
+ 1 file changed, 1 insertion(+)
+
+--- a/drivers/hv/Kconfig
++++ b/drivers/hv/Kconfig
+@@ -18,6 +18,7 @@ config HYPERV_TIMER
+ config HYPERV_UTILS
+ 	tristate "Microsoft Hyper-V Utilities driver"
+ 	depends on HYPERV && CONNECTOR && NLS
++	depends on PTP_1588_CLOCK_OPTIONAL
+ 	help
+ 	  Select this option to enable the Hyper-V Utilities.
+