ARM: Tegra: Defined ARCH_NR_GPIOS for tegra chip

ARM: Tegra: Defined ARCH_NR_GPIOS for tegra chip

The default value of ARCH_NR_GPIOS is defined to 256. That is not enough
for Tegra based board such as ventana. Ventana has 224 gpios on Tegra
soc and other gpio expanders like PMU and audio codecs. Extended GPIO
numbers to make external gpio pins work.

fixes bug 766757

Change-Id: Iaa4dba1881bc9824151e99976308d7dadba752d2
Reviewed-on: http://git-master/r/21199
Reviewed-by: Bharat Nihalani <bnihalani@nvidia.com>
Tested-by: Bharat Nihalani <bnihalani@nvidia.com>
Reviewed-by: Sachin Nikam <snikam@nvidia.com>