compat code: Fix compile failure of av7110.c on Kernel 2.6.27

av7110.c does not compile against a 2.6.27 kernel, as the
inclusion of linux/byteorder/swabb.h is now conditional with

#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 27)

But the byteorder changes in kernel took place after Kernel 2.6.27, so the
compat code needs to look like this:

#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 28)

Signed-off-by: Matthias Schwarzott <zzam@gentoo.org>

Index: v4l-dvb/linux/drivers/media/dvb/ttpci/av7110.c
===================================================================
--- v4l-dvb.orig/linux/drivers/media/dvb/ttpci/av7110.c
+++ v4l-dvb/linux/drivers/media/dvb/ttpci/av7110.c
@@ -52,7 +52,7 @@
 #include <linux/kthread.h>
 #include <asm/unaligned.h>
 #include <asm/byteorder.h>
-#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 27)
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 28)
 #include <linux/byteorder/swabb.h>
 #endif