clk: imx8mp: fix sai4 clock

The reference manual don't mention a SAI4 hardware block. This would be
clock slice 78 which is skipped (TRM, page 237). Remove any reference to
this clock to align the driver with the reality.

Fixes: 9c140d99 ("clk: imx: Add support for i.MX8MP clock driver")
Acked-by: Stephen Boyd <sboyd@kernel.org>
Signed-off-by: Marco Felsch <m.felsch@pengutronix.de>
Link: https://lore.kernel.org/r/20230731142150.3186650-1-m.felsch@pengutronix.deSigned-off-by: Abel Vesa <abel.vesa@linaro.org>

drivers/clk/imx/clk-imx8mp.c

@@ -178,10 +178,6 @@ static const char * const imx8mp_sai3_sels[] = {"osc_24m", "audio_pll1_out", "au
 						"video_pll1_out", "sys_pll1_133m", "osc_hdmi",
 						"clk_ext3", "clk_ext4", };
 
-static const char * const imx8mp_sai4_sels[] = {"osc_24m", "audio_pll1_out", "audio_pll2_out",
-						"video_pll1_out", "sys_pll1_133m", "osc_hdmi",
-						"clk_ext1", "clk_ext2", };
-
 static const char * const imx8mp_sai5_sels[] = {"osc_24m", "audio_pll1_out", "audio_pll2_out",
 						"video_pll1_out", "sys_pll1_133m", "osc_hdmi",
 						"clk_ext2", "clk_ext3", };
@@ -567,7 +563,6 @@ static int imx8mp_clocks_probe(struct platform_device *pdev)
 	hws[IMX8MP_CLK_SAI1] = imx8m_clk_hw_composite("sai1", imx8mp_sai1_sels, ccm_base + 0xa580);
 	hws[IMX8MP_CLK_SAI2] = imx8m_clk_hw_composite("sai2", imx8mp_sai2_sels, ccm_base + 0xa600);
 	hws[IMX8MP_CLK_SAI3] = imx8m_clk_hw_composite("sai3", imx8mp_sai3_sels, ccm_base + 0xa680);
-	hws[IMX8MP_CLK_SAI4] = imx8m_clk_hw_composite("sai4", imx8mp_sai4_sels, ccm_base + 0xa700);
 	hws[IMX8MP_CLK_SAI5] = imx8m_clk_hw_composite("sai5", imx8mp_sai5_sels, ccm_base + 0xa780);
 	hws[IMX8MP_CLK_SAI6] = imx8m_clk_hw_composite("sai6", imx8mp_sai6_sels, ccm_base + 0xa800);
 	hws[IMX8MP_CLK_ENET_QOS] = imx8m_clk_hw_composite("enet_qos", imx8mp_enet_qos_sels, ccm_base + 0xa880);