board/solidrun/macchiatobin: update BSP components version in documentation

commit: https://git.buildroot.net/buildroot/commit/?id=3f0ee529083e972be9893676fab00ac50c2816c3
branch: https://git.buildroot.net/buildroot/commit/?id=refs/heads/master

Update the listed versions to match current status since commit b4d9b515088d ("configs/solidrun_macchiatobin: bump BSP components").

All components are now from upstream so no need to state that for each one.

---
 board/solidrun/macchiatobin/readme.txt | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

index 7412951aab..ef5a6cba6b 100644
@@ -13,9 +13,9 @@ How to build
 ============
 
 Default configuration provides the following BSP versions:
- - Linux v5.6.3 (mainline)
- - U-Boot v2020.01 (mainline)
- - ATF v1.5-18.12.2 (Marvell)
+ - Linux v5.10.5
+ - U-Boot v2020.10
+ - ATF v2.4
 
 To build images run the following commands:
 

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