powerpc/configs: Set more PPC debug configs

Add more config options that wouldn't be done by the generic debug
config in kernel/configs/debug.config

CONFIG_JUMP_LABEL_FEATURE_CHECK_DEBUG
Adds an initialized check on each (cpu|mmu)_has_feature()

CONFIG_PPC_IRQ_SOFT_MASK_DEBUG
Adds some extra checks around IRQ mask manipulation

CONFIG_PPC_KUAP_DEBUG
Adds some extra KAUP checks around interrupts/context switching

CONFIG_PPC_RFI_SRR_DEBUG
Adds some extra SSR checks around interrupts/syscalls

Signed-off-by: Benjamin Gray <bgray@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20230830044238.578840-1-bgray@linux.ibm.com

powerpc/configs: Add debug config fragment

Add a debug config fragment that we can use to put useful debug
options into.

It can be used like:
# make foo_defconfig
# make debug.config

Currently the only option included is to enable debugfs SCOM access.

Suggested-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Andrew Donnellan <ajd@linux.ibm.com>
[mpe: Drop the special targets, just use the fragment directly]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20190801045855.5822-1-ajd@linux.ibm.com