configs: list "implied" device groups in the default configs

Match the optional device groups to what is actually included in
the config-devices.mak files.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

configs/devices/arm-softmmu/default.mak

@@ -1,5 +1,7 @@
 # Default configuration for arm-softmmu
 
+# Uncomment the following lines to disable these optional devices:
+# CONFIG_I2C_DEVICES=n
 # CONFIG_PCI_DEVICES=n
 # CONFIG_TEST_DEVICES=n
 

configs/devices/loongarch64-softmmu/default.mak

@@ -1,3 +1,6 @@
 # Default configuration for loongarch64-softmmu
 
+# Uncomment the following lines to disable these optional devices:
+# CONFIG_PCI_DEVICES=n
+
 CONFIG_LOONGARCH_VIRT=y

configs/devices/or1k-softmmu/default.mak

@@ -1,5 +1,9 @@
 # Default configuration for or1k-softmmu
 
+# Uncomment the following lines to disable these optional devices:
+# CONFIG_PCI_DEVICES=n
+# CONFIG_TEST_DEVICES=n
+
 # Boards:
 #
 CONFIG_OR1K_SIM=y

configs/devices/ppc-softmmu/default.mak

@@ -1,5 +1,9 @@
 # Default configuration for ppc-softmmu
 
+# Uncomment the following lines to disable these optional devices:
+# CONFIG_PCI_DEVICES=n
+# CONFIG_TEST_DEVICES=n
+
 # For embedded PPCs:
 CONFIG_E500PLAT=y
 CONFIG_MPC8544DS=y

configs/devices/riscv32-softmmu/default.mak

@@ -1,8 +1,8 @@
 # Default configuration for riscv32-softmmu
 
 # Uncomment the following lines to disable these optional devices:
-#
-#CONFIG_PCI_DEVICES=n
+# CONFIG_PCI_DEVICES=n
+# CONFIG_TEST_DEVICES=n
 
 # Boards:
 #

configs/devices/riscv64-softmmu/default.mak

@@ -1,8 +1,8 @@
 # Default configuration for riscv64-softmmu
 
 # Uncomment the following lines to disable these optional devices:
-#
-#CONFIG_PCI_DEVICES=n
+# CONFIG_PCI_DEVICES=n
+# CONFIG_TEST_DEVICES=n
 
 # Boards:
 #

configs/devices/xtensa-softmmu/default.mak

@@ -1,5 +1,9 @@
 # Default configuration for Xtensa
 
+# Uncomment the following lines to disable these optional devices:
+#
+#CONFIG_PCI_DEVICES=n
+
 # Boards:
 #
 CONFIG_XTENSA_SIM=y