Revert "powerpc/ps3_defconfig: Disable PPC64_BIG_ENDIAN_ELF_ABI_V2"

This reverts commit 482b718a.

The preceding commits by Nicholas Piggin enable PS3 support for ELFv2,
so there's no need to disable it for PS3 anymore.
Signed-off-by: Geoff Levand <geoff@infradead.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/983836405df1b6001a2262972fb32d1aee97d6f5.1705654669.git.geoff@infradead.org

arch/powerpc/configs/ps3_defconfig

@@ -24,7 +24,6 @@ CONFIG_PS3_VRAM=m
 CONFIG_PS3_LPM=m
 # CONFIG_PPC_OF_BOOT_TRAMPOLINE is not set
 CONFIG_KEXEC=y
-# CONFIG_PPC64_BIG_ENDIAN_ELF_ABI_V2 is not set
 CONFIG_PPC_4K_PAGES=y
 CONFIG_SCHED_SMT=y
 CONFIG_PM=y