x86/rtc: Remove unused intel-mid.h

The rtc driver used to be disabled with a direct check for Intel MID
platforms. But that direct check was replaced long ago (see second
link). Remove the (unused since 2016) include.

[ dhansen: rewrite changelog to include some history ]

Signed-off-by: Andy Shevchenko <[e-mail]>
Signed-off-by: Dave Hansen <[e-mail]>
Link: https://lore.kernel.org/all/20240305161024.1364098-1-andriy.shevchenko%40linux.intel.com
Link: https://lore.kernel.org/all/[e-mail]

arch/x86/kernel/rtc.c

···
 #include <asm/vsyscall.h>
 #include <asm/x86_init.h>
 #include <asm/time.h>
-#include <asm/intel-mid.h>
 #include <asm/setup.h>
 
 #ifdef CONFIG_X86_32