ibmpc: Fix start bit error for Zenith Z-150 AT #661

ibmpc_host_send() can miss 1st clock from Zenith Z-150 AT sometimes.
#661 (comment)

tmk_core/protocol/ibmpc.c

@@ -111,7 +111,7 @@ int16_t ibmpc_host_send(uint8_t data)
     data_lo();
     wait_us(100);
     clock_hi();     // [5]p.54 [clock low]>100us [5]p.50
-    WAIT(clock_lo, 10000, 1);   // [5]p.53, -10ms [5]p.50
+    WAIT(clock_lo, 60000, 1);   // [5]p.53, -10ms [5]p.50
 
     /* Data bit[2-9] */
     for (uint8_t i = 0; i < 8; i++) {
@@ -162,6 +162,8 @@ int16_t ibmpc_host_send(uint8_t data)
     // https://github.com/tmk/tmk_keyboard/wiki/IBM-PC-AT-Keyboard-Protocol#zenith-z-150-beige
     if (!ibmpc_protocol && ibmpc_error == 7) { goto RECV; }
 
+    inhibit();
+    wait_ms(2);
     idle();
     IBMPC_INT_ON();
     return -1;