Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/arch/powerpc/include/asm/cpm.h b/arch/powerpc/include/asm/cpm.h
index e50323f..4398a6c 100644
--- a/arch/powerpc/include/asm/cpm.h
+++ b/arch/powerpc/include/asm/cpm.h
@@ -98,7 +98,7 @@
 #define BD_SC_INTRPT	(0x1000)	/* Interrupt on change */
 #define BD_SC_LAST	(0x0800)	/* Last buffer in frame */
 #define BD_SC_TC	(0x0400)	/* Transmit CRC */
-#define BD_SC_CM	(0x0200)	/* Continous mode */
+#define BD_SC_CM	(0x0200)	/* Continuous mode */
 #define BD_SC_ID	(0x0100)	/* Rec'd too many idles */
 #define BD_SC_P		(0x0100)	/* xmt preamble */
 #define BD_SC_BR	(0x0020)	/* Break received */