Update KSPP recommendations

config_files/kspp-recommendations/kspp-recommendations-arm.config

 # CONFIGs
-# Linux/arm 4.20.0 Kernel Configuration
+# Linux/arm 5.4.0 Kernel Configuration
 
 # Report BUG() conditions and kill the offending process.
 CONFIG_BUG=y

config_files/kspp-recommendations/kspp-recommendations-arm64.config

 # CONFIGs
-# Linux/arm64 4.20.0 Kernel Configuration
+# Linux/arm64 5.4.0 Kernel Configuration
 
 # Report BUG() conditions and kill the offending process.
 CONFIG_BUG=y

config_files/kspp-recommendations/kspp-recommendations-x86-32.config

 # CONFIGs
-# Linux/i386 4.20.0 Kernel Configuration
+# Linux/i386 5.4.0 Kernel Configuration
 
 # Report BUG() conditions and kill the offending process.
 CONFIG_BUG=y
@@ -165,3 +165,10 @@ CONFIG_DEFAULT_MMAP_MIN_ADDR=65536
 # Randomize position of kernel.
 CONFIG_RANDOMIZE_BASE=y
 
+# Enable Kernel Page Table Isolation to remove an entire class of cache timing side-channels.
+CONFIG_PAGE_TABLE_ISOLATION=y
+
+# Don't allow for 16-bit program emulation and associated LDT tricks.
+# CONFIG_MODIFY_LDT_SYSCALL is not set
+
+

config_files/kspp-recommendations/kspp-recommendations-x86-64.config

 # CONFIGs
-# Linux/x86_64 4.20.0 Kernel Configuration
+# Linux/x86_64 5.4.0 Kernel Configuration
 
 # Report BUG() conditions and kill the offending process.
 CONFIG_BUG=y
@@ -149,8 +149,7 @@ CONFIG_GCC_PLUGIN_STACKLEAK=y
 # use with caution or also use CONFIG_GCC_PLUGIN_RANDSTRUCT_PERFORMANCE=y
 CONFIG_GCC_PLUGIN_RANDSTRUCT=y
 
-
-#x86_64
+# x86_64
 
 # Full 64-bit means PAE and NX bit.
 CONFIG_X86_64=y