gpio: stmfx: add function stmfx_read_reg and stmfx_write_reg
Add the helper functions stmfx_read_reg() and stmfx_write_reg() to avoid duplicated code for access to stmfx's register with mask. Signed-off-by: NPatrick Delaunay <patrick.delaunay@st.com> Reviewed-by: NPatrice Chotard <patrice.chotard@st.com>
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