clk: imx7d: fix ahb clock mux 1

The clock parent of the AHB root clock when using mux option 1
is the SYS PLL 270MHz clock. This is specified in Table 5-11
Clock Root Table of the i.MX 7Dual Applications Processor
Reference Manual.

While it could be a documentation error, the 270MHz parent is
also mentioned in the boot ROM configuration in Table 6-28: The
clock is by default at 135MHz due to a POST_PODF value of 1
(=> divider of 2).

Signed-off-by: Stefan Agner <[e-mail]>
Signed-off-by: Shawn Guo <[e-mail]>

drivers/clk/imx/clk-imx7d.c

···
 	"pll_sys_pfd2_135m_clk", "pll_sys_pfd6_clk", "pll_enet_250m_clk",
 	"pll_audio_main_clk", };
 
-static const char *ahb_channel_sel[] = { "osc", "pll_sys_pfd2_135m_clk",
+static const char *ahb_channel_sel[] = { "osc", "pll_sys_pfd2_270m_clk",
 	"pll_dram_533m_clk", "pll_sys_pfd0_392m_clk",
 	"pll_enet_125m_clk", "pll_usb_main_clk", "pll_audio_main_clk",
 	"pll_video_main_clk", };