Modify gPXE core and drivers to work with the new timer subsystem

Signed-off-by: Alexey Zaytsev <alexey.zaytsev@gmail.com>

src/drivers/bus/eisa.c

@@ -4,7 +4,7 @@
 #include <stdio.h>
 #include <errno.h>
 #include <io.h>
-#include <timer.h>
+#include <unistd.h>
 #include <gpxe/eisa.h>
 
 static struct eisa_driver eisa_drivers[0]

src/drivers/bus/isapnp.c

@@ -61,7 +61,7 @@
 #include <stdio.h>
 #include <errno.h>
 #include <io.h>
-#include <timer.h>
+#include <unistd.h>
 #include <gpxe/isapnp.h>
 
 /**

src/drivers/bus/mca.c

@@ -11,7 +11,6 @@
 #include <stdio.h>
 #include <errno.h>
 #include <io.h>
-#include <timer.h>
 #include <gpxe/mca.h>
 
 static struct mca_driver mca_drivers[0]