trivial: style

Signed-off-by: Oliver Scott <Oliver.Scott@data61.csiro.au>

supress-gcc-warnings: util-libs

-Use const in correct places
-Use casts
-Return correct interface type

Signed-off-by: Oliver Scott <Oliver.Scott@data61.csiro.au>

exynos/serial: Attempt TX IRQ handle on uart write

Updated exynos_uart_write to try and process a TX IRQ for
draining/freeing up the TX FIFO. This is a slight optimisation
to maximize the amount of data we can write and free up the write
descriptor.

exynos/serial: Fixed macro typo

Incorrect capitalization in CON_RX_TIMEOUT_MASK definition.

platsupport: use ZF_LOG* instead of custom macros

This commit removes redundant definitions of debug print macros
and replaces them with use of ZF_LOG*.

platsupport/exynos: Added ps_cdev_static_init

Created a static initialisation function for the
exynos character device. This allows the user to pass in a
pre-mapped vaddr for the uart device + additional uart parameters.

platsupport/exynos: Refactored exynos_serial_init

Split up the exynos serial init implementation into multiple
functions. This makes the initialisation implementation more
modular for different serial initialisation functions.

platsupport: Exynos: Update the mux_feature_enable and its invocations

Fix whitespace

- remove trailing whitespace
- remove duplicate blank lines
- remove blank lines at end of file

Change 1 << * to BIT(*) in some cases

fix licenses

Remove trailing whitespace

libplatsupport: clear RX interrupt after RX irq callback (Exynos, serial)

This fixes issue #3

libplatsupport: Refactor serial port functions for exynos