m68knommu: Fix MCFUART_TXFIFOSIZE for m548x.
m68knommu: Fix MCFUART_TXFIFOSIZE for m548x.

Serial lines on the MCF548x have really big fifos : 512 bytes.

Signed-off-by: Philippe De Muyter <f1d5d9ae7ed80900d12a7e800195edd90db9f6f7@macqel.be>
Signed-off-by: Greg Ungerer <ed22c22dbde360207569092e60b4298397efb8da@uclinux.org>

KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs