x86: initialize initial FPU state earlier

Make it under SI_SUB_CPU sysinit, instead of much later SI_SUB_DRIVERS.
The SI_SUB_DRIVERS survived from times when FPU used real ISA attachment,
now it is only pnp stub claiming id.

PR:	255997
Reviewed by:	jhb
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Differential revision:	https://reviews.freebsd.org/D30512

sys/amd64/amd64/fpu.c

@@ -495,7 +495,7 @@ fpuinitstate(void *arg __unused)
 	intr_restore(saveintr);
 }
 /* EFIRT needs this to be initialized before we can enter our EFI environment */
-SYSINIT(fpuinitstate, SI_SUB_DRIVERS, SI_ORDER_FIRST, fpuinitstate, NULL);
+SYSINIT(fpuinitstate, SI_SUB_CPU, SI_ORDER_ANY, fpuinitstate, NULL);
 
 /*
  * Free coprocessor (if we have it).

sys/i386/i386/npx.c

@@ -551,7 +551,7 @@ npxinitstate(void *arg __unused)
 	start_emulating();
 	intr_restore(saveintr);
 }
-SYSINIT(npxinitstate, SI_SUB_DRIVERS, SI_ORDER_ANY, npxinitstate, NULL);
+SYSINIT(npxinitstate, SI_SUB_CPU, SI_ORDER_ANY, npxinitstate, NULL);
 
 /*
  * Free coprocessor (if we have it).