[cpu] Split cpuid validation into separate lib

In order to allow the bootloader to do preliminary CPUID validation
while UEFI is still handling displaying information to the user, split
most of the kernel's CPUID handling into a library to be used by both
kernel and boot.

modules.yaml

@@ -6,6 +6,7 @@ modules:
         output: jsix.elf
         target: host
         deps:
+            - cpu
             - kutil
         includes:
             - src/kernel
@@ -62,6 +63,8 @@ modules:
         kind: exe
         target: boot
         output: boot.efi
+        deps:
+            - cpu
         source:
             - src/boot/main.cpp
             - src/boot/console.cpp
@@ -110,6 +113,14 @@ modules:
             - src/libraries/kutil/memory.cpp
             - src/libraries/kutil/printf.c
 
+    cpu:
+        kind: lib
+        output: libcpu.a
+        includes:
+            - src/libraries/cpu/include
+        source:
+            - src/libraries/cpu/cpu.cpp
+
 
     libc:
         kind: lib