pbl_macros.h: add ram size detector

Signed-off-by: Oleksij Rempel <linux@rempel-privat.de>
board_pbl_start.h: add nop

Signed-off-by: Oleksij Rempel <linux@rempel-privat.de>
pbl_macros.h: move nops

Signed-off-by: Oleksij Rempel <linux@rempel-privat.de>
board_pbl_start.h: uart0

Signed-off-by: Oleksij Rempel <linux@rempel-privat.de>
pbl_macros.h: remove unused parts from pll init

Signed-off-by: Oleksij Rempel <linux@rempel-privat.de>