misc: Fix typos in comments

Codespell found and fixed these new typos:

* doesnt -> doesn't
* funtion -> function
* perfomance -> performance
* remaing -> remaining

A coding style issue (line too long) was fixed manually.
Signed-off-by: NStefan Weil <sw@weilnetz.de>
Reviewed-by: NAndreas Färber <afaerber@suse.de>
Signed-off-by: NMichael Tokarev <mjt@tls.msk.ru>

hw/intc/arm_gic_kvm.c

@@ -148,7 +148,7 @@ typedef void (*vgic_translate_fn)(GICState *s, int irq, int cpu,
                                   uint32_t *field, bool to_kernel);
 
 /* synthetic translate function used for clear/set registers to completely
- * clear a setting using a clear-register before setting the remaing bits
+ * clear a setting using a clear-register before setting the remaining bits
  * using a set-register */
 static void translate_clear(GICState *s, int irq, int cpu,
                             uint32_t *field, bool to_kernel)

hw/net/fsl_etsec/rings.c

@@ -195,8 +195,8 @@ static void process_tx_fcb(eTSEC *etsec)
 
     /* if packet is IP4 and IP checksum is requested */
     if (flags & FCB_TX_IP && flags & FCB_TX_CIP) {
-        /* do IP4 checksum (TODO This funtion does TCP/UDP checksum but not sure
-         * if it also does IP4 checksum. */
+        /* do IP4 checksum (TODO This function does TCP/UDP checksum
+         * but not sure if it also does IP4 checksum.) */
         net_checksum_calculate(etsec->tx_buffer + 8,
                 etsec->tx_buffer_len - 8);
     }

target-arm/helper.c

@@ -488,7 +488,7 @@ static const ARMCPRegInfo v6_cp_reginfo[] = {
 
 static CPAccessResult pmreg_access(CPUARMState *env, const ARMCPRegInfo *ri)
 {
-    /* Perfomance monitor registers user accessibility is controlled
+    /* Performance monitor registers user accessibility is controlled
      * by PMUSERENR.
      */
     if (arm_current_pl(env) == 0 && !env->cp15.c9_pmuserenr) {

target-ppc/int_helper.c

@@ -2216,7 +2216,7 @@ static int bcd_cmp_mag(ppc_avr_t *a, ppc_avr_t *b)
         uint8_t dig_a = bcd_get_digit(a, i, &invalid);
         uint8_t dig_b = bcd_get_digit(b, i, &invalid);
         if (unlikely(invalid)) {
-            return 0; /* doesnt matter */
+            return 0; /* doesn't matter */
         } else if (dig_a > dig_b) {
             return 1;
         } else if (dig_a < dig_b) {