[ARM] 3406/1: lpd7x: compilation fix for smc91x

Patch from Marc Singer

Reworking of the adaptation macros to allow driver to compile again
for the lpd7x's.  Also, support added for the lh79520 so it may use
the smc91x.

Signed-off-by: Marc Singer <elf@buici.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>