common: fix regression on block cache init

m68k needs block cache list initialized after relocation.
Other architectures must not be involved.

Fixing regression related to:

commit 1526bcce0f7285087621e16e6720636d01839da8
	("common: add blkcache init")

Signed-off-by: Angelo Durgehello <angelo.dureghello@timesys.com>
2 files changed