clk: renesas: r8a779h0: Add INTC-EX clock

Add the module clock used by the Interrupt Controller for External
Devices (INTC-EX) aka IRQC on the Renesas R-Car V4M (R8A779H0) SoC.

Signed-off-by: Cong Dang <cong.dang.xn@renesas.com>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/e260fd8eac0187c690ac6c62673b29f97e2ad5a4.1713279470.git.geert+renesas@glider.be

Author: CongDang

drivers/clk/renesas/r8a779h0-cpg-mssr.c

@@ -184,6 +184,7 @@ static const struct mssr_mod_clk r8a779h0_mod_clks[] = {
 	DEF_MOD("i2c1",		519,	R8A779H0_CLK_S0D6_PER),
 	DEF_MOD("i2c2",		520,	R8A779H0_CLK_S0D6_PER),
 	DEF_MOD("i2c3",		521,	R8A779H0_CLK_S0D6_PER),
+	DEF_MOD("irqc",		611,	R8A779H0_CLK_CL16M),
 	DEF_MOD("msi0",		618,	R8A779H0_CLK_MSO),
 	DEF_MOD("msi1",		619,	R8A779H0_CLK_MSO),
 	DEF_MOD("msi2",		620,	R8A779H0_CLK_MSO),