Patch from Ben Dooks

Fix missing changelog entries in <asm-arm/arch-s3c2410/hardware.h>,
and erroneous EINT definitions in <asm-arm/arch-s3c2410/regs-gpio.h>.

Added s3c2410_gpio_getcfg(pin) and s3c2410_gpio_getirq(pin)
to get the current configuration of an pin, and which IRQ
(if any) maps to it.

Signed-off-by: Ben Dooks