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(cherry picked from commit 85502fd1becd71b365b71f4a8fd308ae4953025e)

Signed-off-by: Yuri Tikhonov <yur@emcraft.com>

Supported:
 - UART0 (57600)
 - SPI0 (non-DMA)
 - Ethernet
 - LPDDR
 - Env in SPI Flash

Support the following features:
 * Serial console on USART0.
 * Common pin configuration functions (needed for USART0).
 * Clock configuration: The Cortex-M4 core runs at 204 MHz.
 * `cptf` command is technically available, but has no effect since there is no
internal flash on LPC18x0/LPC43x0 MCUs.
 * The lowest SRAM region (128 KB at 0x10000000) is reserved for the currently
running U-Boot image.

 * Simplify source code.
 * Let us completely disable the `.ramcode` section for the MCUs to be supported
in the future, e.g. LPC43xx and LPC18xx.

This change does not make usage of the `.ramcode` section optional.

Stubs for twr-k60n512 port.

The `.kinetis_flash_conf` section is necessary to keep the MCU flash
unprotected and allow future flash programming.

This port does not work, because the Watchdog Timer is not unlocked and
the MCU is reset by WDT shortly after start-up.

Stubs for ea-lpc1788 port.

Signed-off-by: Yuri Tikhonov <yur@emcraft.com>

There's no so much differences between different families of STM32.
Manual (migrate STM32F1 -> STM32F2) says, that GPIO and Flash are
significantly different, the other interfaces (we use) are almost
the same. So, let's name this arch as 'stm32', not 'stm32f2' (as we
do this in linux).
Signed-off-by: Yuri Tikhonov <yur@emcraft.com>

Little code cleanup for CM3 and A2F targets.

Stubs for stm3220g-eval port.
Signed-off-by: Yuri Tikhonov <yur@emcraft.com>