mfd: lpc_sch: Partially revert "Add support for Intel Quark X1000"

mfd: lpc_sch: Partially revert "Add support for Intel Quark X1000"

[ Upstream commit 922e8ce883e59b52786b2c11656d84dc58ef084a ]

The IRQ support for SCH GPIO is not specific to the Intel Quark SoC.
Moreover the IRQ routing is quite interesting there, so while it's
needs a special support, the driver haven't it anyway yet.

Due to above remove basically redundant code of IRQ support.

This reverts commit ec689a8a8155ce8b966bd5d7737a3916f5e48be3.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>