perf: Add initial Linux performance guide for am65x 11.02 release

Add the initial Linux performance guide for 11.02 release for
am65x device.

Note that the following sections are missing & will potentially be
added in subsequent PR:
- boot-time measurement
- Ethernet
-IPSec Software Performance

Signed-off-by: Judith Mendez <[email protected]>

Author: jmenti

source/devices/AM65X/linux/Release_Specific_Performance_Guide.rst

@@ -1,6 +1,6 @@
-======================================
- Linux 09.03 Performance Guide
-======================================
+==============================
+ Linux 11.02 Performance Guide
+==============================
 
 RT Kernel Performance Guide
 =================================