2.4 IA64 config help update

This updates some IA64-specific config help text to match what's in 2.5.

=== Documentation/Configure.help 1.192 vs edited ==--- 1.192/Documentation/Configure.help Wed Sep 3 18:40:00 2003
+++ edited/Documentation/Configure.help Wed Sep 10 14:13:05 2003
@@ -27000,11 +27000,13 @@
# Choice: ia64type
Itanium
CONFIG_ITANIUM

-  Select your IA64 processor type.  The default is Intel Itanium.
+  Select your IA-64 processor type.  The default is Intel Itanium.
+  This choice is safe for all IA-64 systems, but may not perform
+  optimally on systems with, say, Itanium 2 or newer processors.

-McKinley
+Itanium 2
CONFIG_MCKINLEY
- Select this to configure for a McKinley processor.
+ Select this to configure for an Itanium 2 (McKinley) processor.

# Choice: ia64system
IA-64 system type
@@ -27060,6 +27062,14 @@
CONFIG_IA64_MCA
Say Y here to enable machine check support for IA-64. If you're unsure, answer Y.
+
+Use PAL_HALT_LIGHT in idle loop
+CONFIG_IA64_PAL_IDLE

+  Say Y here to enable use of PAL_HALT_LIGHT in the cpu_idle loop.
+  This allows the CPU to enter a low power state when idle.  You
+  can enable CONFIG_IA64_PALINFO and check /proc/pal/cpu0/power_info
+  to see the power consumption and latency for this state.  If you're
+  unsure your firmware supports it, answer N.

Disable IA-64 Virtual Hash Page Table
CONFIG_DISABLE_VHPT