bcm53xx: enable CLK_BCM_NSP for kernel 4.9

This is required to get booting kernel.

Signed-off-by: Rafał Miłecki <[email protected]>

target/linux/bcm53xx/config-4.9

@@ -78,7 +78,7 @@ CONFIG_CLKSRC_MMIO=y
 CONFIG_CLKSRC_OF=y
 CONFIG_CLKSRC_PROBE=y
 # CONFIG_CLK_BCM_NS2 is not set
-# CONFIG_CLK_BCM_NSP is not set
+CONFIG_CLK_BCM_NSP=y
 CONFIG_CLONE_BACKWARDS=y
 CONFIG_COMMON_CLK=y
 CONFIG_COMMON_CLK_IPROC=y