vmm: update Linux commandlines

- The 5.16 akaros-guest no longer needs the lapic command.
- We don't want to bother with spectre and whatnot in the guest.
- Tinycore doesn't need nortc anymore.

Signed-off-by: Barret Rhoden <brho@cs.berkeley.edu>

kern/kfs/tinycore_cmdline

diff --git a/kern/kfs/tinycore_cmdline b/kern/kfs/tinycore_cmdline
index 1e751f7..0373c4f 100644
--- a/kern/kfs/tinycore_cmdline
+++ b/kern/kfs/tinycore_cmdline
@@ -1,5 +1,4 @@
 earlyprintk=akaros
  console=hvc0
- lapic=notscdeadline
- nortc
+ mitigations=off
  nozswap

kern/kfs/vmimage_cmdline

diff --git a/kern/kfs/vmimage_cmdline b/kern/kfs/vmimage_cmdline
index 38434e6..d38ad85 100644
--- a/kern/kfs/vmimage_cmdline
+++ b/kern/kfs/vmimage_cmdline
@@ -1,6 +1,5 @@
 earlyprintk=akaros
  console=hvc0
- lapic=notscdeadline
- nortc
+ mitigations=off
  nozswap
  root=/dev/vda1