arm64: dts: ti: k3-pinctrl: Fix the bug in existing macros

arm64: dts: ti: k3-pinctrl: Fix the bug in existing macros

Currently, DS_IO_OVERRIDE_EN_SHIFT macro is not defined anywhere but
used for defining other macro.
Replace this undefined macro with valid macro. Rename the existing macro
to reflect the actual behavior.

Fixes: 325aa0f6b36e ("arm64: dts: ti: k3-pinctrl: Introduce deep sleep macros")
Reviewed-by: Kendall Willis <k-willis@ti.com>
Reviewed-by: Dhruva Gole <d-gole@ti.com>
Reviewed-by: Vignesh Raghavendra <vigneshr@ti.com>
Signed-off-by: Akashdeep Kaur <a-kaur@ti.com>
Fixes: 325aa0f6b36e ("arm64: dts: ti: k3-pinctrl: Introduce deep sleep macros")
Link: https://patch.msgid.link/20250909044108.2541534-5-a-kaur@ti.com
Signed-off-by: Nishanth Menon <nm@ti.com>