image: move idle and nosmt to aws-only images (#2297)

We don't want these options on other CSPs. This is temporary until AWS
fixed some background issues.
We need to set the option we want to set differently on each provider
once per provider as we need to keep some of the options we set with
higher priority.

image/mkosi.conf.d/mkosi.aws.conf

@@ -1,2 +1,5 @@
 [Match]
 PathExists=../.csp/aws
+
+[Output]
+KernelCommandLine=mitigations=auto idle=poll

image/mkosi.conf.d/mkosi.azure.conf

@@ -1,2 +1,5 @@
 [Match]
 PathExists=../.csp/azure
+
+[Output]
+KernelCommandLine=mitigations=auto,nosmt

image/mkosi.conf.d/mkosi.conf

@@ -6,7 +6,7 @@ Release=38
 Format=disk
 ManifestFormat=json,changelog
 Bootable=yes
-KernelCommandLine=mitigations=auto idle=poll preempt=full rd.shell=0 rd.emergency=reboot loglevel=8 console=ttyS0
+KernelCommandLine=preempt=full rd.shell=0 rd.emergency=reboot loglevel=8 console=ttyS0
 SplitArtifacts=yes
 # Enable Secure Boot with own PKI
 SecureBoot=yes

image/mkosi.conf.d/mkosi.gcp.conf

@@ -1,2 +1,5 @@
 [Match]
 PathExists=../.csp/gcp
+
+[Output]
+KernelCommandLine=mitigations=auto,nosmt

image/mkosi.conf.d/mkosi.openstack.conf

@@ -2,7 +2,7 @@
 PathExists=../.csp/openstack
 
 [Output]
-KernelCommandLine=mem_encrypt=on kvm_amd.sev=1 module_blacklist=qemu_fw_cfg console=tty0 console=ttyS0
+KernelCommandLine=mem_encrypt=on kvm_amd.sev=1 module_blacklist=qemu_fw_cfg console=tty0 console=ttyS0 mitigations=auto,nosmt
 
 [Content]
 Autologin=yes

image/mkosi.conf.d/mkosi.qemu.conf

@@ -4,3 +4,6 @@ PathExists=../.csp/qemu
 [Content]
 Autologin=yes
 Environment=CONSOLE_MOTD=true
+
+[Output]
+KernelCommandLine=mitigations=auto,nosmt