pinctrl: qcom: Drop redundant intr_target_reg on modern SoCs

pinctrl: qcom: Drop redundant intr_target_reg on modern SoCs

On all Qualcomm TLMM generations from APQ8084 onwards, the interrupt
target routing bits are located in the same register as the interrupt
configuration bits (intr_cfg_reg). Only five older SoCs — APQ8064,
IPQ8064, MDM9615, MSM8660 and MSM8960 — have a genuinely separate
interrupt target routing register at a different offset (0x400 + 0x4 * id).

Replace MSM_ACCESSOR(intr_target) with a custom accessor that falls back
to intr_cfg_reg when intr_target_reg is zero. Apply the same fallback in
the SCM path. Drop the now-redundant .intr_target_reg initializer from
all SoC drivers where it duplicated intr_cfg_reg, keeping it only in
the five drivers where it genuinely differs.

Signed-off-by: Mukesh Ojha <mukesh.ojha@oss.qualcomm.com>
Signed-off-by: Linus Walleij <linusw@kernel.org>