ARM: imx: Annotate imx7d_enet_init() as __init

After a recent LLVM change [1] that deduces __cold on functions that
only call cold code (such as __init functions), there is a section
mismatch warning from imx7d_enet_init(), which got moved to
.text.unlikely. as a result of that optimization:

  WARNING: modpost: vmlinux: section mismatch in reference: imx7d_enet_init+0x20 (section: .text.unlikely.) -> imx7d_enet_clk_sel (section: .init.text)

Drop the inline keyword (which does not guarantee inlining) and replace
it with __init, as imx7d_enet_init() is only called from __init code,
which clears up the warning.

Link: https://github.com/llvm/llvm-project/commit/6b11573b8c5e3d36beee099dbe7347c2a007bf53 [1]
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/mach-imx/mach-imx7d.c

@@ -48,7 +48,7 @@ static void __init imx7d_enet_clk_sel(void)
 	}
 }
 
-static inline void imx7d_enet_init(void)
+static void __init imx7d_enet_init(void)
 {
 	imx7d_enet_phy_init();
 	imx7d_enet_clk_sel();