mfd: vexpress-sysreg: Use more common syntax for compound literals

The (typeof(foo)) construct is unusual in the kernel, use a more typical
syntax by explicitly spelling out the type.

Link: https://lore.kernel.org/all/20250909-gpio-mmio-gpio-conv-part4-v1-13-9f723dc3524a@linaro.org/


Suggested-by: Andy Shevchenko <andriy.shevchenko@intel.com>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Acked-by: Sudeep Holla <sudeep.holla@arm.com>
Link: https://lore.kernel.org/r/20250910-make-compound-literals-normal-again-v1-1-076ee7738a0b@linaro.org


Signed-off-by: Lee Jones <lee@kernel.org>