Fix misc spelling errors found by lintian

Signed-off-by: Loïc Minier <loic.minier@linaro.org>
diff --git a/arch/arm/cpu/arm920t/at91rm9200/ether.c b/arch/arm/cpu/arm920t/at91rm9200/ether.c
index e1cdeba..d7135c5 100644
--- a/arch/arm/cpu/arm920t/at91rm9200/ether.c
+++ b/arch/arm/cpu/arm920t/at91rm9200/ether.c
@@ -39,7 +39,7 @@
 #define RBF_MULTICAST (1<<30)
 #define RBF_UNICAST   (1<<29)
 #define RBF_EXTERNAL  (1<<28)
-#define RBF_UNKOWN    (1<<27)
+#define RBF_UNKNOWN   (1<<27)
 #define RBF_SIZE      0x07ff
 #define RBF_LOCAL4    (1<<26)
 #define RBF_LOCAL3    (1<<25)
diff --git a/arch/sparc/cpu/leon2/cpu_init.c b/arch/sparc/cpu/leon2/cpu_init.c
index a24f778..795c7d7 100644
--- a/arch/sparc/cpu/leon2/cpu_init.c
+++ b/arch/sparc/cpu/leon2/cpu_init.c
@@ -47,9 +47,9 @@
  * initialize a bunch of registers.
  *
  * Run from FLASH/PROM:
- *  - until memory controller is set up, only registers avaiable
+ *  - until memory controller is set up, only registers available
  *  - no global variables available for writing
- *  - constants avaiable
+ *  - constants available
  */
 
 void cpu_init_f(void)
diff --git a/arch/sparc/cpu/leon3/cpu_init.c b/arch/sparc/cpu/leon3/cpu_init.c
index be22ec2..cba9d0e 100644
--- a/arch/sparc/cpu/leon3/cpu_init.c
+++ b/arch/sparc/cpu/leon3/cpu_init.c
@@ -57,9 +57,9 @@
  * initialize a bunch of registers.
  *
  * Run from FLASH/PROM:
- *  - until memory controller is set up, only registers avaiable
+ *  - until memory controller is set up, only registers available
  *  - no global variables available for writing
- *  - constants avaiable
+ *  - constants available
  */
 
 void cpu_init_f(void)