Cosmetic: Fix a number of typos, no functional changes.

Fix various misspellings of things like "environment", "kernel",
"default" and "volatile", and throw in a couple grammar fixes.

Signed-off-by: Robert P. J. Day <rpjday@crashcourse.ca>

arch/arm/cpu/arm926ejs/at91/eflash.c

@@ -28,7 +28,7 @@
  * by u-Boot commands.
  *
  * Note: Redundant environment will not work in this flash since
- * it does use partial page writes. Make sure the environent spans
+ * it does use partial page writes. Make sure the environment spans
  * whole pages!
  */
 

arch/arm/cpu/arm926ejs/kirkwood/cpu.c

@@ -302,7 +302,7 @@ int arch_cpu_init(void)
 	/*
 	 * Configures the I/O voltage of the pads connected to Egigabit
 	 * Ethernet interface to 1.8V
-	 * By defult it is set to 3.3V
+	 * By default it is set to 3.3V
 	 */
 	reg = readl(KW_REG_MPP_OUT_DRV_REG);
 	reg |= (1 << 7);