Revert "uart: pl011: Rename regs with enumeration"

This reverts commit 534e14e2 as with
this patch the serial console is broken on lots of platforms.
Reported-by: NMarc Zyngier <marc.zyngier@arm.com>
Cc: Jun Nie <jun.nie@linaro.org>
Acked-by: NWill Deacon <will.deacon@arm.com>
Tested-by: NWill Deacon <will.deacon@arm.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>