HV: remove DBG_LEVEL_PARSE

- It is meaningless to enable debug function in parse_hv_cmdline() because
the function run in very eary stage and uart has not been initialized at
that time, so remove this debug level definition;

- Rewrite parse_hv_cmdline() function to make it compliant with MISRA-C;

- Decouple uart16550 stuff from Init.c module and let console.c handle it;

Tracked-On: #4419

Signed-off-by: Victor Sun <victor.sun@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>

hypervisor/boot/include/guest/vboot.h

@@ -26,6 +26,6 @@ uint64_t get_ap_trampoline_buf(void);
 void *get_rsdp_ptr(void);
 
 enum vboot_mode get_sos_boot_mode(void);
-int32_t parse_hv_cmdline(void);
+void parse_hv_cmdline(void);
 
 #endif /* end of include guard: VBOOT_H */