spi: lantiq: Move interrupt control register offesets to SoC specific data structure

Address of Interrupt control registers are different on new chipsets.
So move them to SoC specific data structure.

Signed-off-by: Dilip Kota <eswara.kota@linux.intel.com>
Link: https://lore.kernel.org/r/f0f9723a30ea9c2ee48d2199f7512af9e15803b0.1594957019.git.eswara.kota@linux.intel.com


Signed-off-by: Mark Brown <broonie@kernel.org>