gpio: aspeed-sgpio: Create llops to handle hardware access

Add low-level operations (llops) to abstract the register access for SGPIO
registers. With this abstraction layer, the driver can separate the
hardware and software logic, making it easier to extend the driver to
support different hardware register layouts.
The llops abstraction changes the programming semantics from bitmask-based
writes to a value-based interface.

Instead of passing a pre-shifted bitmask to the caller, the driver now
passes:
- the GPIO offset, and
- the value to be set (0 or 1),

and the llops helpers are responsible for deriving the correct register
and bit position internally.

As a result, assignments such as:
  type0 = 1;
  type1 = 1;
  type2 = 1;
do not represent a behavioral change. They indicate that the bit
corresponding to the given GPIO offset should be set, with the actual
bit manipulation handled by llops.

Reviewed-by: Linus Walleij <linusw@kernel.org>
Signed-off-by: Billy Tsai <billy_tsai@aspeedtech.com>
Link: https://lore.kernel.org/r/20260123-upstream_sgpio-v2-3-69cfd1631400@aspeedtech.com
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>

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