mv643xx_eth: delete unused port serial control register bit defines
mv643xx_eth: delete unused port serial control register bit defines

Over half of the port serial control register bit defines are never
used, and the PORT_SERIAL_CONTROL_DEFAULT_VALUE define is never used
either.  Keep only those defines that are actually used.

Signed-off-by: Lennert Buytenhek <8858498612e3a522354216649776e3032dcb7e5b@marvell.com>
Acked-by: Dale Farnsworth <80b24d51bbcd1ba9a2ce6b5fe97e28c44f9ff374@farnsworth.org>

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