common/lcd.c: remove global lcd_base

lcd_base is available as gd->fb_base as well, there is no need
to keep a seperate copy.

Cc: Alessandro Rubini <rubini@unipv.it>
Cc: Anatolij Gustschin <agust@denx.de>
Cc: Bo Shen <voice.shen@atmel.com>
Cc: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
Cc: Kyungmin Park <kyungmin.park@samsung.com>
Cc: Marek Vasut <marek.vasut@gmail.com>
Cc: Minkyu Kang <mk7.kang@samsung.com>
Cc: Nikita Kiryanov <nikita@compulab.co.il>
Cc: Simon Glass <sjg@chromium.org>
Cc: Stelian Pop <stelian@popies.net>
Cc: Tom Warren <twarren@nvidia.com>
common/lcd: clean up a bit

This patch
 - Make the brackets of the function call a bit more consistent
 - Remove really unnessary brackets.
 - Removes the extern from the function definitions
 - Remove curtly brackets from single line statements
 - Remove lcd_setmem proto since it is already in common.h
 - Don't init globals to 0

cc: Anatolij Gustschin <agust@denx.de>
lcd, fb: remove prototypes already in lcd.h and unused code

cc: Anatolij Gustschin <agust@denx.de>
cc: Cliff Brake <cliff.brake@gmail.com>
cc: John Zhan <zhanz@sinovee.com>
cc: Marek Vasut <marek.vasut@gmail.com>
cc: Wolfgang Denk <wd@denx.de>
api/api_display: use the getters for console size info

cc: Che-Liang Chiou <clchiou@chromium.org>
common/lcd.c: move the macro's to the c file

cc: Anatolij Gustschin <agust@denx.de>