Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/arch/arm/mach-davinci/dm644x.c b/arch/arm/mach-davinci/dm644x.c
index 9a2376b..5f8a654 100644
--- a/arch/arm/mach-davinci/dm644x.c
+++ b/arch/arm/mach-davinci/dm644x.c
@@ -274,7 +274,7 @@
 	.name = "timer2",
 	.parent = &pll1_aux_clk,
 	.lpsc = DAVINCI_LPSC_TIMER2,
-	.usecount = 1,              /* REVISIT: why cant' this be disabled? */
+	.usecount = 1,              /* REVISIT: why can't' this be disabled? */
 };
 
 static struct clk_lookup dm644x_clks[] = {