ARM: 9262/1: remove lazy evaluation in Makefile

arch-y and tune-y used lazy evaluation since they used to contain

cc-option checks. They don't any longer, so just eagerly evaluate these
command line flags.

Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>