clk: renesas: Drop USB extal from the R8A7792 clock driver

The R8A7792 does not have the USB extal, so drop it.
Signed-off-by: NMarek Vasut <marek.vasut+renesas@gmail.com>
Cc: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>

drivers/clk/renesas/r8a7792-cpg-mssr.c

@@ -214,10 +214,8 @@ static const struct cpg_mssr_info r8a7792_cpg_mssr_info = {
 	.mstp_table		= r8a7792_mstp_table,
 	.mstp_table_size	= ARRAY_SIZE(r8a7792_mstp_table),
 	.reset_node		= "renesas,r8a7792-rst",
-	.extal_usb_node		= "usb_extal",
 	.mod_clk_base		= MOD_CLK_BASE,
 	.clk_extal_id		= CLK_EXTAL,
-	.clk_extal_usb_id	= CLK_USB_EXTAL,
 	.pll0_div		= 2,
 	.get_pll_config		= r8a7792_get_pll_config,
 };