dt-bindings: pinctrl: qcom,eliza-tlmm: Split QUP lane mirror alternates

dt-bindings: pinctrl: qcom,eliza-tlmm: Split QUP lane mirror alternates

Several QUP lanes have MIRA/MIRB mirror routings that let the same lane
be muxed out on alternative GPIOs. On Eliza these were all collapsed
under the base function name (e.g. qup1_se6), which prevented boards
from selecting the mirror variants.

Add explicit function names for each mirror lane, matching the pattern
already established by qcom,sm8550-tlmm and related bindings.

Signed-off-by: Alexander Koskovich <akoskovich@pm.me>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Signed-off-by: Linus Walleij <linusw@kernel.org>