clk: renesas: r8a77965: Add CPEX clock

Implement support for the CPEX clock on R-Car M3-N.  This clock can be
selected as a clock source for CMT1 (Compare Match Timer Type 1).
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Stephen Boyd <sboyd@kernel.org>

drivers/clk/renesas/r8a77965-cpg-mssr.c

@@ -100,6 +100,7 @@ static const struct cpg_core_clk r8a77965_core_clks[] __initconst = {
 
 	DEF_FIXED("cl",		R8A77965_CLK_CL,	CLK_PLL1_DIV2,	48, 1),
 	DEF_FIXED("cp",		R8A77965_CLK_CP,	CLK_EXTAL,	2, 1),
+	DEF_FIXED("cpex",	R8A77965_CLK_CPEX,	CLK_EXTAL,	2, 1),
 
 	DEF_DIV6P1("canfd",	R8A77965_CLK_CANFD,	CLK_PLL1_DIV4,	0x244),
 	DEF_DIV6P1("csi0",	R8A77965_CLK_CSI0,	CLK_PLL1_DIV4,	0x00c),