lpc2000: Improve lpc2000 flash driver.

lpc2000: Improve lpc2000 flash driver.

This patch adds flash programming support for LPC5410x and LPC82x.
And adds auto flash size detection for LPC800 series.
Tested on below listed boards/chips.
LPC54102(LPCLPC54102Xpresso)
LPC824(LPCXpresso824-MAX)
LPC812(LPC812MAX)
LPC811,LPC810

Change-Id: Ie68b6d425b17ccfa83814607ee61056e99800c1c
Signed-off-by: Nemui Trinomius <nemuisan_kawausogasuki@live.jp>
Reviewed-on: http://openocd.zylin.com/2442
Tested-by: jenkins
Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>
Reviewed-by: Paul Fertser <fercerpav@gmail.com>