i2c: xiic: Add atomic transfer support

Rework the read and write code paths in the driver to support operation
in atomic contexts.

Similar changes have been implemented in other drivers, including:
commit 3a5ee18 ("i2c: imx: implement master_xfer_atomic callback")
commit 445094c ("i2c: exynos5: add support for atomic transfers")
commit ede2299 ("i2c: tegra: Support atomic transfers")
commit fe402bd ("i2c: meson: implement the master_xfer_atomic
callback")

Signed-off-by: Manikanta Guntupalli <manikanta.guntupalli@amd.com>
Acked-by: Michal Simek <michal.simek@amd.com>
Link: https://lore.kernel.org/r/20241210095242.1982770-3-manikanta.guntupalli@amd.com
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>

Author: Manikanta Guntupalli