powerpc/configs: Add PAPR_SCM to pseries_defconfig

This is a pseries only driver, it should be built by default as part of
pseries_defconfig to get some build coverage.
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210416111209.765444-1-mpe@ellerman.id.au

arch/powerpc/configs/pseries_defconfig

@@ -41,6 +41,7 @@ CONFIG_DTL=y
 CONFIG_SCANLOG=m
 CONFIG_PPC_SMLPAR=y
 CONFIG_IBMEBUS=y
+CONFIG_PAPR_SCM=m
 CONFIG_PPC_SVM=y
 # CONFIG_PPC_PMAC is not set
 CONFIG_RTAS_FLASH=m