code: dodge PAGE_SIZE #define

Some header files, specifically for OSX and Musl libc define PAGE_SIZE to be a number
This is great except in yuzu we're using PAGE_SIZE as a variable

Specific example
`static constexpr u64 PAGE_SIZE = u64(1) << PAGE_BITS;`

PAGE_SIZE PAGE_BITS PAGE_MASK are all similar variables.
Simply deleted the underscores, and then added YUZU_ prefix

Might be worth noting that there are multiple uses in different classes/namespaces
This list may not be exhaustive

Core::Memory   12 bits (4096)
QueryCacheBase 12 bits
ShaderCache    14 bits (16384)
TextureCache   20 bits (1048576, or 1MB)

Fixes #8779

src/core/loader/kip.cpp

@@ -14,7 +14,7 @@ namespace Loader {
 
 namespace {
 constexpr u32 PageAlignSize(u32 size) {
-    return static_cast<u32>((size + Core::Memory::PAGE_MASK) & ~Core::Memory::PAGE_MASK);
+    return static_cast<u32>((size + Core::Memory::YUZU_PAGEMASK) & ~Core::Memory::YUZU_PAGEMASK);
 }
 } // Anonymous namespace
 

src/core/loader/nro.cpp

@@ -125,7 +125,7 @@ FileType AppLoader_NRO::IdentifyType(const FileSys::VirtualFile& nro_file) {
 }
 
 static constexpr u32 PageAlignSize(u32 size) {
-    return static_cast<u32>((size + Core::Memory::PAGE_MASK) & ~Core::Memory::PAGE_MASK);
+    return static_cast<u32>((size + Core::Memory::YUZU_PAGEMASK) & ~Core::Memory::YUZU_PAGEMASK);
 }
 
 static bool LoadNroImpl(Kernel::KProcess& process, const std::vector<u8>& data) {

src/core/loader/nso.cpp

@@ -45,7 +45,7 @@ std::vector<u8> DecompressSegment(const std::vector<u8>& compressed_data,
 }
 
 constexpr u32 PageAlignSize(u32 size) {
-    return static_cast<u32>((size + Core::Memory::PAGE_MASK) & ~Core::Memory::PAGE_MASK);
+    return static_cast<u32>((size + Core::Memory::YUZU_PAGEMASK) & ~Core::Memory::YUZU_PAGEMASK);
 }
 } // Anonymous namespace