hv: s3: hwp: enable hwp after resume from s3

After Service OS resume from s3, an error occurs:

[3649827us][cpu=1][idle1][sev=2][seq=1749]:= Unhandled exception: 13 (General Protection)

[3658622us][cpu=1][idle1][sev=2][seq=1750]:
Host Registers:

[3664881us][cpu=1][idle1][sev=2][seq=1751]:=  Vector=0x000000000000000D  RIP=0x000000000040F9F0

[3674213us][cpu=1][idle1][sev=2][seq=1752]:=     RAX=0x0000000080003801  RBX=0x0000000001800800  RCX=0x0000000000000774

[3685787us][cpu=1][idle1][sev=2][seq=1753]:=     RDX=0x0000000000000000  RDI=0x0000000000000080  RSI=0x0000000000000000

[3697371us][cpu=1][idle1][sev=2][seq=1754]:=     RSP=0x0000000000616C18  RBP=0x0000000000616C38  RBX=0x0000000001800800

[3708947us][cpu=1][idle1][sev=2][seq=1755]:=      R8=0x0000000000000038   R9=0x0000000000000001  R10=0x00000000000003F8

[3720539us][cpu=1][idle1][sev=2][seq=1756]:=     R11=0x000000000000000D  R12=0x0000000000458245  R13=0x0000000000000000

[3732114us][cpu=1][idle1][sev=2][seq=1757]:=  RFLAGS=0x0000000000010202  R14=0x0000000000000000  R15=0x0000000000000000

[3743699us][cpu=1][idle1][sev=2][seq=1758]:= ERRCODE=0x0000000000000000   CS=0x0000000000000008   SS=0x0000000000000010

[3755305us][cpu=1][idle1][sev=2][seq=1759]:= CR2=0x0000000000000000

The error occurs in `msr_write(MSR_IA32_HWP_REQUEST, reg)`, when HWP is
not available.

This patch is to initialize HWP after resume.

Tracked-On: #8623
Signed-off-by: Haiwei Li <haiwei.li@intel.com>

hypervisor/arch/x86/pm.c

@@ -216,6 +216,7 @@ void host_enter_s3(const struct pm_s_state_data *sstate_data, uint32_t pm1a_cnt_
 	resume_lapic();
 	resume_iommu();
 	resume_ioapic();
+	init_frequency_policy();
 
 	vmx_on();
 	CPU_IRQ_ENABLE_ON_CONFIG();