powerpc: Restore CONFIG_DEBUG_INFO in defconfigs

Commit f9b3cd24 ("Kconfig.debug: make DEBUG_INFO selectable from a
choice") broke the selection of CONFIG_DEBUG_INFO by powerpc defconfigs.

It is now necessary to select one of the three DEBUG_INFO_DWARF*
options to get DEBUG_INFO enabled.

Replace DEBUG_INFO=y by DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y in all
defconfigs using the following command:

sed -i s/DEBUG_INFO=y/DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y/g `git grep -l DEBUG_INFO arch/powerpc/configs/`

Fixes: f9b3cd24 ("Kconfig.debug: make DEBUG_INFO selectable from a choice")
Cc: stable@vger.kernel.org
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/98a4c2603bf9e4b776e219f5b8541d23aa24e854.1654930308.git.christophe.leroy@csgroup.eu