Kernel: cleanup includes

I went quickly went through all files since I found some weird
includes :D

kernel/kernel/FS/Ext2.cpp

@@ -1,7 +1,6 @@
 #include <BAN/ScopeGuard.h>
 #include <BAN/StringView.h>
 #include <kernel/FS/Ext2.h>
-#include <kernel/Process.h>
 #include <kernel/RTC.h>
 
 #define EXT2_DEBUG_PRINT 0

kernel/kernel/FS/VirtualFileSystem.cpp

@@ -4,7 +4,6 @@
 #include <kernel/FS/Ext2.h>
 #include <kernel/FS/VirtualFileSystem.h>
 #include <kernel/LockGuard.h>
-#include <kernel/PCI.h>
 
 namespace Kernel
 {