pinctrl: qcom: add multi TLMM region option parameter

pinctrl: qcom: add multi TLMM region option parameter

Add support for selecting multiple TLMM regions using the
tlmm-test tool.
The current implementation only selects the TLMM Node region
0, which can lead to incorrect region selection.

QCS 615 TLMM Node dts reg:
	tlmm: pinctrl@3100000 {
		compatible = "qcom,qcs615-tlmm";
		reg = <0x0 0x03100000 0x0 0x300000>,
		      <0x0 0x03500000 0x0 0x300000>,
		      <0x0 0x03d00000 0x0 0x300000>;
		reg-names = "east",
			    "west",
			    "south";

QCS615 gpio57 is in the south region with an offset of 0x39000,
and its address is 0x3d39000. However, the default region selection
is region 0 (east region), resulting in a wrong calculated address
of 0x3139000.

Add a tlmm option parameter named tlmm_reg_name to select the region.
If the user does not input the parameter, the default region is 0.

Signed-off-by: Yuanjie Yang <quic_yuanjiey@quicinc.com>
Link: https://lore.kernel.org/20250624090600.91063-1-quic_yuanjiey@quicinc.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>