ARM: sunxi: Correct comment for MBUS1 register in sun6i clock definitions

Signed-off-by: Chen-Yu Tsai <wens@csie.org>
ARM: sunxi: Allow specifying module in prcm apb0 init function

The prcm apb0 controls multiple modules. Allow specifying which
modules to enable clocks and de-assert resets so the function
can be reused.

Signed-off-by: Chen-Yu Tsai <wens@csie.org>
ARM: sunxi: Add basic A23 support

The basic blocks of the A23 are similar to the A31 (sun6i). Re-use
sun6i code for initial clock, gpio, and uart setup.

Signed-off-by: Chen-Yu Tsai <wens@csie.org>
ARM: sunxi: Add support for using R_UART as console

The R_UART is the only uart other than UART0 on port F which has
usable pads for attaching a console. Support it so we can still
have a console when using MMC on port F.

Signed-off-by: Chen-Yu Tsai <wens@csie.org>