In "struct div4_clk", the "flags" field is unused.

Remove it, and update the "div4_clks" array accordingly.

Found with cppcheck, unusedStructMember.
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Tested-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/658e6b1b23d5b66646bb830361b8c55ccf797771.1713025170.git.christophe.jaillet@wanadoo.frSigned-off-by: Geert Uytterhoeven <geert+renesas@glider.be>