FROMLIST: memblock: print kernel internal size

Kernel internal size information is also useful to compare with other
binary. This patch print kernel text, rwdata, rodata, bss, and others.

Here's an example.

Reserved    : 1181708 KB
 .kernel    :  296172 KB
  .text     :   16960 KB
  .rwdata   :    2299 KB
  .rodata   :   16464 KB
  .bss      :    7549 KB
  .memmap   :  196608 KB
  .etc      :   56293 KB
 .unusable  :  885536 KB

Bug: 340432773
Signed-off-by: Jaewon Kim <jaewon31.kim@samsung.com>
Link: https://lore.kernel.org/linux-mm/20240521023957.2587005-10-jaewon31.kim@samsung.com/
Change-Id: I3954640772dfe1917d488440f06b671102e2c06c