lib/logic_iomem: correct fallback config references

lib/logic_iomem: correct fallback config references

BugLink: https://bugs.launchpad.net/bugs/1969107
[ Upstream commit 2a6852cb8ff0c8c1363cac648d68489343813212 ]

Due to some renaming, we ended up with the "indirect iomem"
naming in Kconfig, following INDIRECT_PIO. However, clearly
I missed following through on that in the ifdefs, but so far
INDIRECT_IOMEM_FALLBACK isn't used by any architecture.

Reported-by: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Fixes: ca2e334232b6 ("lib: add iomem emulation (logic_iomem)")
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Sasha Levin <sashal@kernel.org>
(cherry picked from commit 2be1a7f09635031aab33b7400d3c991876b74b5d)
Signed-off-by: Paolo Pisati <paolo.pisati@canonical.com>