Fix various typos, scattered over the code.

Spelling corrections for (among other things):

* environment
* override
* variable
* ftd (should be "fdt", for flattened device tree)
* embedded
* FTDI
* emulation
* controller

arch/arm/cpu/armv8/fsl-layerscape/fsl_lsch3_speed.c

@@ -180,7 +180,7 @@ ulong get_ddr_freq(ulong ctrl_num)
 
 	/*
 	 * DDR controller 0 & 1 are on memory complex 0
-	 * DDR controler 2 is on memory complext 1
+	 * DDR controller 2 is on memory complext 1
 	 */
 #ifdef CONFIG_SYS_FSL_HAS_DP_DDR
 	if (ctrl_num >= 2)

arch/arm/mach-uniphier/boot-mode/boot-mode.c

@@ -114,7 +114,7 @@ static int do_mmcsetn(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 
 U_BOOT_CMD(
 	   mmcsetn,	1,	1,	do_mmcsetn,
-	"Set the first MMC (not SD) dev number to \"mmc_first_dev\" enviroment",
+	"Set the first MMC (not SD) dev number to \"mmc_first_dev\" environment",
 	""
 );
 #endif

arch/mips/Kconfig

@@ -145,7 +145,7 @@ config MIPS_BOOT_ENV_LEGACY
 	  Enable this option if you want U-Boot to hand over the Yamon-style
 	  environment to the kernel. Information like memory size, initrd
 	  address and size will be prepared as zero-terminated key/value list.
-	  The address of the enviroment is stored in register $a2.
+	  The address of the environment is stored in register $a2.
 
 config MIPS_BOOT_FDT
 	bool "Hand over a flattened device tree to Linux kernel"

arch/powerpc/cpu/ppc4xx/denali_spd_ddr2.c

@@ -1151,7 +1151,7 @@ phys_size_t initdram(int board_type)
 	dram_size *= ranks;
 	debug("dram_size = %lu\n", dram_size);
 
-	/* Start the SDRAM controler */
+	/* Start the SDRAM controller */
 	mtsdram(DDR0_02, DDR0_02_START_ENCODE(1));
 	denali_wait_for_dlllock();