lmb: Add generic arch_lmb_reserve_generic()

The arc/arm/m68k/microblaze/mips/ppc arch_lmb_reserve() implementations
are all mostly the same, except for a couple of details. Implement a
generic arch_lmb_reserve_generic() function which can be parametrized
enough to cater for those differences between architectures. This can
also be parametrized enough so it can handle cases where U-Boot is not
relocated to the end of DRAM e.g. because there is some other reserved
memory past U-Boot (e.g. unmovable firmware for coprocessor), it is not
relocated at all, and other such use cases.

Signed-off-by: Marek Vasut <[email protected]>
Cc: Alexey Brodkin <[email protected]>
Cc: Angelo Dureghello <[email protected]>
Cc: Daniel Schwierzeck <[email protected]>
Cc: Eugeniy Paltsev <[email protected]>
Cc: Hai Pham <[email protected]>
Cc: Michal Simek <[email protected]>
Cc: Simon Goldschmidt <[email protected]>
Cc: Tom Rini <[email protected]>
Cc: Wolfgang Denk <[email protected]>
Reviewed-by: Tom Rini <[email protected]>

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