kernel: Add CONFIG_PPC_QUEUED_SPINLOCKS configuration option

The CONFIG_PPC_QUEUED_SPINLOCKS configuration option is not defined for
kernel 5.15, it is defined for kernel 5.10.

This fixes the compilation of mpc85xx/p2020 with kernel 5.15.

Reviewed-by: Robert Marko <[email protected]>
Signed-off-by: Hauke Mehrtens <[email protected]>

target/linux/generic/config-5.15

@@ -4779,6 +4779,7 @@ CONFIG_PPC_4K_PAGES=y
 # CONFIG_PPC_DISABLE_WERROR is not set
 # CONFIG_PPC_EMULATED_STATS is not set
 # CONFIG_PPC_EPAPR_HV_BYTECHAN is not set
+# CONFIG_PPC_QUEUED_SPINLOCKS is not set
 # CONFIG_PPP is not set
 # CONFIG_PPPOATM is not set
 # CONFIG_PPPOE is not set

target/linux/mpc85xx/p1020/config-default

@@ -34,7 +34,6 @@ CONFIG_MUTEX_SPIN_ON_OWNER=y
 CONFIG_NET_FLOW_LIMIT=y
 CONFIG_NR_CPUS=2
 CONFIG_PADATA=y
-# CONFIG_PPC_QUEUED_SPINLOCKS is not set
 CONFIG_REGMAP_IRQ=y
 CONFIG_REGULATOR=y
 CONFIG_RFS_ACCEL=y