Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/drivers/net/sungem.c b/drivers/net/sungem.c
index c1a3448..d3be735 100644
--- a/drivers/net/sungem.c
+++ b/drivers/net/sungem.c
@@ -1150,7 +1150,7 @@
 	val &= ~(PCS_CFG_ENABLE | PCS_CFG_TO);
 	writel(val, gp->regs + PCS_CFG);
 
-	/* Advertise all capabilities except assymetric
+	/* Advertise all capabilities except asymmetric
 	 * pause.
 	 */
 	val = readl(gp->regs + PCS_MIIADV);