clk: renesas: r8a7796: Add INTC-EX clock

Add the "intc-ex" clock to the R8A7796 CPG MSSR driver.

According to information from the hardware team the INTC-EX
parent clock is CP. The next data sheet version will include
this information.

[takeshi.kihara.df: Ported from commit f099aa075749 ("clk: shmobile:
 r8a7795: Add INTC-EX clock") to drivers/clk/renesas/r8a7796-cpg-mssr.c]
Signed-off-by: Takeshi Kihara <takeshi.kihara.df@renesas.com>
Signed-off-by: Yoshihiro Kaneko <ykaneko0929@gmail.com>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

drivers/clk/renesas/r8a7796-cpg-mssr.c

@@ -141,6 +141,7 @@ static const struct mssr_mod_clk r8a7796_mod_clks[] __initconst = {
 	DEF_MOD("usb-dmac0",		 330,	R8A7796_CLK_S3D1),
 	DEF_MOD("usb-dmac1",		 331,	R8A7796_CLK_S3D1),
 	DEF_MOD("rwdt",			 402,	R8A7796_CLK_R),
+	DEF_MOD("intc-ex",		 407,	R8A7796_CLK_CP),
 	DEF_MOD("intc-ap",		 408,	R8A7796_CLK_S3D1),
 	DEF_MOD("audmac1",		 501,	R8A7796_CLK_S0D3),
 	DEF_MOD("audmac0",		 502,	R8A7796_CLK_S0D3),