dpll: zl3073x: Fix build failure

If CONFIG_ZL3073X is enabled but both CONFIG_ZL3073X_I2C and
CONFIG_ZL3073X_SPI are disabled, the compilation may fail because
CONFIG_REGMAP is not enabled.

Fix the issue by selecting CONFIG_REGMAP when CONFIG_ZL3073X is enabled.

Fixes: 2df8e64e ("dpll: Add basic Microchip ZL3073x support")
Signed-off-by: Ivan Vecera <ivecera@redhat.com>
Link: https://patch.msgid.link/20250726184145.25769-1-ivecera@redhat.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>