ANDROID: arch: arm: Increase kernel command line size

Android passes a lot of arguments via kernel command line.
Current kernel command line is close to limit on a lot of devices.

Increase kernel command line size to avoid cases when arguments
are trimmed.

Bug: 158450572
Change-Id: I998ce98b4d875e8bb435ba1dfd84d94506ac0319
Signed-off-by: Alistair Delva <adelva@google.com>